XANSYS Message: 3850 [Go back to message list]
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Subject: Re: PowerGraphics
Author: Joe Metrisin
Date: 1999-08-09 13:13:00

It took me a long time, but I finally convinced myself that powergraphics is
better than full graphics for plotting element results. I still curse it at
times for a number of reasons. For example, in the post processor if you
try to list element nodal results on your model, you only get results for
nodes on the surface (powergraphics database). From a user's point of view,
why would a graphics setting affect listings?

Joseph T. Metrisin

Structural Methods
Pratt & Whitney/United Technologies
M/S: 714-03
P.O. Box 109600
West Palm Beach, FL. 33410-9600

Phone: (561) 796-5967
Fax: (561) 796-8993

> From: Hunt, Glen[SMTP:Glen.Hunt@A...]
> Sent: Monday, August 09, 1999 12:33 PM
> To: 'XANSYS Users'
> Subject: RE: [xansys] PowerGraphics

> From: "Hunt, Glen"

> John,

> I couldn't agree with you more regarding the accuracy of power
> graphics..............It's a wonderfull thing actually and I use it
> almost exclusively now. However, when NOT in POST1 the utility of the
> PowerGraphics is akin to the proverbial teats on a bore hog. I
> personally don't like watching the GUI go through its dual mode plot
> machinations.............furthermore, I simply don't like waiting on
> it...................Perhaps this is what these folks are complaining
> about.

> Glen Hunt
> AlliedSignal Engines

> From: Crawford, John
> To: ANSYS Users List
> Subject: [xansys] PowerGraphics
> Date: Monday, August 09, 1999 6:02AM

> From: "Crawford, John"

> Why are some people unhappy with PowerGraphics? My own experience has
> been that PowerGraphics is more accurate than Full Graphics for any case
> where the highest stress is on the exterior of the body, and it's faster
> too. PowerGraphics also displays top and bottom stresses on shell
> elements at the same time, which is kind of nice. My only complaint is
> that PowerGraphics doesn't give the SBMN and SBMX values on the contour
> displays. When doing postprocessing of tet element models, I'll
> occasionally switch from PowerGraphics to Full Graphics as a way of
> evaluating how adequate my mesh is. If the answers are signficantly
> different I will either refine the mesh, recognize that the discrepency
> is due to a singularity and ignore the results there, or I'll document
> that there is significant uncertaintly regarding the accuracy of the
> results obtained in this region. Hopefully, by switching between
> PowerGraphics and Full Graphics, plotting the SDSG (or TDSG) values,
> comparing PLNS and PLES results, and reviewing SBMN and SBMX (when Full
> Graphics is on) I can ascertain how much meshing error is present in my
> results. It's not enough for me to provide an answer. I also have to
> provide an estimate of how accurate I think these answers are.

> Which brings me back to PowerGraphics. Are people upset about
> PowerGraphics because it frequently yields higher anwers for tet
> elements? If so, is this a legitimate complaint or is it a case of
> shooting the messenger? I've heard one or two comments regarding
> turning PowerGraphics off which make perfectly good sense, such as when
> initially reviewing subsurface stresses like those found in Hertz
> contact problems. But for the vast majority of cases I've found
> PowerGraphics to be faster and more accurate than Full Graphics.

> There are special cases when I'll use Full Graphics, such as comparing
> new results to prior results which were postprocessed using Full
> Graphics. But if speed and accuracy are of interest to me, I use
> PowerGraphics.

> Maybe I've missed something. Would anybody care to comment why they
> prefer Full Graphics over PowerGraphics? Perhaps someone can share an
> insight that will make us all a bit better at our chosen craft.

> Thanks.

> John Crawford
> AlliedSignal Engines
> Phoenix, AZ
> john.crawford@a...

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3051Re: PowerGraphicsSam J. Alhadeff salhadeff@1999/07/02 
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3058Re: PowerGraphics -ReplyMAHESWAR D.UMA. DUM@1999/07/05 
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3076Re: PowergraphicsKhanh duong KDUONG@1999/07/06 
3078Re: PowergraphicsMoses Chan1999/07/06 
3079PowerGraphics & AccuracyChandresh Shah1999/07/06 
3082Re: PowerGraphics & AccuracyJoe Metrisin1999/07/060
3086Re: PowerGraphics -ReplyBill Bulat1999/07/06 
3837PowerGraphicsJohn Crawford1999/08/09 
3847Re: PowerGraphicsGlen Hunt1999/08/09 
3850Re: PowerGraphicsJoe Metrisin1999/08/09 
3852Re: PowerGraphicsScott Reiss1999/08/09 
3854PowerGraphics -ReplyJamie Orr1999/08/09 
3857Re: PowerGraphicsErnst Hustedt1999/08/09 
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3954More Powergraphics and a SCL questionDon Shaffer1999/08/13 
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